Cartoons today are still pretty good. My Little Pony: Friendship is Magic, Adventure Time, Scooby Doo Mystery Incorporated, Avengers: Earth's Mightiest Heroes, and Batman: The Brave & The Bold are all stand outs.
Regular Show and Archer are awesome too. And Phineas & Ferb and The Amazing World of Gumball are pretty inventive and fun, even if though they're definitely for a younger audience.